After pink and purple leotards at past Olympics, it’s Stars and Stripes, for now

The online world of gymnastics fans, known as the gymternet, knows its stuff. It can decipher a twist from a turn, debate the finer points of executing an Amanar and a Cheng and wrangle for hours over a team lineup.

But on one matter, the gymternet is near united: leotards. Indeed, few gymnastics pleas are as passionate as...